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Letteratura scientifica selezionata sul tema "Asymmetric dynamic duopoly model"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Asymmetric dynamic duopoly model"

Caminal, Ramon. "A Dynamic Duopoly Model with Asymmetric Information". Journal of Industrial Economics 38, n. 3 (marzo 1990): 315. http://dx.doi.org/10.2307/2098501.

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Askar, S. S. "On Complex Dynamics of Differentiated Products: Cournot Duopoly Model under Average Profit Maximization". Discrete Dynamics in Nature and Society 2022 (9 marzo 2022): 1–14. http://dx.doi.org/10.1155/2022/8677470.

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In this paper, some important dynamic characteristics such as multistability and synchronization phenomena are investigated for a game of an economic Cournot duopoly whose time evolution is received by the iteration of a noninvertible map in the plane. In the asymmetric case, the equilibrium points of game’s map are calculated, and their stability conditions are obtained. The obtained results show that the Nash equilibrium point loses its stability through flip bifurcation. Under some restrictions, the map’s coordinate axes form an invariant manifold, and hence their dynamics are studied based on a one-dimensional discrete dynamic map. In the symmetric case where both firms are identical, the map has the property of symmetry, and this implies that the diagonal q 1 = q 2 forms an invariant manifold and therefore synchronization phenomena occur. Global analysis of the behavior of the noninvertible map is carried out through studying critical manifolds of the map that categorize it as Z 4 − Z 2 − Z 0 type. Furthermore, global bifurcation of the basins of attraction is confirmed through contact between the critical curves and the boundaries of escaping domain.

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Yu, Weisheng, e Yu Yu. "The stability of Bayesian Nash equilibrium of dynamic Cournot duopoly model with asymmetric information". Communications in Nonlinear Science and Numerical Simulation 63 (ottobre 2018): 101–16. http://dx.doi.org/10.1016/j.cnsns.2018.03.001.

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Sannikov, Yuliy, e Andrzej Skrzypacz. "Impossibility of Collusion under Imperfect Monitoring with Flexible Production". American Economic Review 97, n. 5 (1 novembre 2007): 1794–823. http://dx.doi.org/10.1257/aer.97.5.1794.

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We show that it is impossible to achieve collusion in a duopoly when (a) goods are homogenous and firms compete in quantities; (b) new, noisy information arrives continuously, without sudden events; and (c) firms are able to respond to new information quickly. The result holds even if we allow for asymmetric equilibria or monetary transfers. The intuition is that the flexibility to respond quickly to new information unravels any collusive scheme. Our result applies to both a simple stationary model and a more complicated one, with prices following a mean-reverting Markov process, as well as to models of dynamic cooperation in many other settings. (JEL D43, L12, L13)

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Jafari, Mostafa, Mohammad Mohammadpour omran e Ehsan Jahani. "Offensive, Defensive, and Generic Advertising Strategies in a Dynamic Oligopolistic Market". Mathematical Problems in Engineering 2021 (7 aprile 2021): 1–29. http://dx.doi.org/10.1155/2021/6633330.

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In today’s highly competitive business environment, advertisement plays an influential role in attracting customers and increasing market share. Companies adopt different advertising strategies in a competitive market, such as offensive, defensive, and generic, to keep and increase their market share. Researchers have generally modeled this problem using a dynamic differential game. All previous research studies have focused on finding these strategies in a duopoly market. Also, to simultaneously determine the optimal equilibrium strategy for these three strategies, the model is designed as a symmetric game due to the ease of solving. In contrast with the previous researches, the purpose of this paper is to present and solve an asymmetric game model to determine the optimal offensive, defensive, and generic advertising strategies in an oligopoly market. The proposed model’s objective is to obtain the maximum equilibrium profit for each company at any moment regarding the market share of each company and those of competitors. A numerical solution method based on the Pontryagin’s maximum principle is developed to solve the model. Then, the proposed model is solved for a triopoly market. Also, the sensitivity of the results to changes in model parameters has been investigated. The obtained results denote that in markets with more than two players under the asymmetric game, the proposed model can prescribe the optimal type of offensive, defensive, and generic advertising strategies.

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Askar, Sameh. "On Dynamic Investigations of Cournot Duopoly Game: When Firms Want to Maximize Their Relative Profits". Symmetry 13, n. 12 (23 novembre 2021): 2235. http://dx.doi.org/10.3390/sym13122235.

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This paper studies a Cournot duopoly game in which firms produce homogeneous goods and adopt a bounded rationality rule for updating productions. The firms are characterized by an isoelastic demand that is derived from a simple quadratic utility function with linear total costs. The two competing firms in this game seek the optimal quantities of their production by maximizing their relative profits. The model describing the game’s evolution is a two-dimensional nonlinear discrete map and has only one equilibrium point, which is a Nash point. The stability of this point is discussed and it is found that it loses its stability by two different ways, through flip and Neimark–Sacker bifurcations. Because of the asymmetric structure of the map due to different parameters, we show by means of global analysis and numerical simulation that the nonlinear, noninvertible map describing the game’s evolution can give rise to many important coexisting stable attractors (multistability). Analytically, some investigations are performed and prove the existence of areas known in literature with lobes.

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Long, Jianjun, e Hui Huang. "Stability of equilibrium production-price in a dynamic duopoly Cournot-Bertrand game with asymmetric information and cluster spillovers". Mathematical Biosciences and Engineering 19, n. 12 (2022): 14056–73. http://dx.doi.org/10.3934/mbe.2022654.

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<abstract><p>Bounded rationality, asymmetric information and spillover effects are widespread in the economic market, and had been studied extensively in oligopoly games, however, few literature discussed the incomplete information between bounded rational oligopolists in an enterprise cluster. Considering the positive externalities brought by the spillover effect between cluster enterprises, a duopoly Cournot-Bertrand game with bounded rationality and asymmetric information is proposed in this paper. In our model, firm 1 with an information advantage knows all the price information of firm 2 with an information advantage, while firm 2 only partially knows the output information of firm 1, and they adopt boundedly rational expectation and naïve expectation respectively. Interestingly, our theoretical analysis reveals that: (1) When the output adjustment speed of enterprises with information advantage is large or the substitutability between monopoly products is high, moderate effective information is beneficial to the stability of product market, while too low or too high effective information may lead to market disorder. (2) The relationship between cluster spillover and Nash equilibrium stability depends on product substitutability. When the substitutability is small, smaller cluster spillovers are more conducive to the stability of product output or price; when the substitutability is large, the larger the cluster spillover is, the more stable the product market is. Our research has an important theoretical and practical significance to the production-price competition in oligopoly markets.</p></abstract>

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Joshi, Sumit. "Asymmetric outcome in a symmetric dynamic duopoly". Journal of Economic Dynamics and Control 31, n. 2 (febbraio 2007): 531–55. http://dx.doi.org/10.1016/j.jedc.2005.12.001.

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Wang, Xia, Di Liu e Jun-Pei Zhang. "Asymmetric Model of the Quantum Stackelberg Duopoly". Chinese Physics Letters 30, n. 12 (dicembre 2013): 120302. http://dx.doi.org/10.1088/0256-307x/30/12/120302.

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Plummer, P. "Competitive Dynamics in Hierarchically Organized Markets: Spatial Duopoly and Demand Asymmetries". Environment and Planning A: Economy and Space 28, n. 11 (novembre 1996): 2021–40. http://dx.doi.org/10.1068/a282021.

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In recent years, there has been considerable interest in the impact of corporate organizational structure on the configuration of prices, outputs, and profits in spatially extensive markets. In previous research I examined the general and analytical conditions defining both the existence and stability of an equilibrium in hierarchically organized spatial markets dominated by oligopolistic corporations that distribute a commodity directly to consumers through their retail franchises. Here I examine the disequilibrium dynamics resulting from this model. A bilevel decisionmaking process is hypothesized in which corporations vary their delivered prices in response to changes in urban market demand and in which franchises vary their retail prices in response both to changes in the cost of the commodity from their parent corporation and to the pricing strategies pursued by their competitors. The complexity of interactions operating between the two levels of the model and the presence of asymmetrical demand conditions facing duopolistic corporations suggests that it is unlikely that an overall spatial price equilibrium can actually be reached by such disequilibrium price-adjustment strategies.

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Più fonti

Tesi sul tema "Asymmetric dynamic duopoly model"

Chalil, Diana. "AN EMPIRICAL ANALYSIS OF ASYMMETRIC DUOPOLY IN THE INDONESIAN CRUDE PALM OIL INDUSTRY". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/2566.

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The apparent increase in market concentration and vertical integration in the Indonesian crude palm oil (CPO) industry has led to concerns about the presence of market power. For the Indonesian CPO industry, such concerns attract more attention because of the importance of this sector to the Indonesian economy. CPO is used as the main raw material for cooking oil (which is an essential commodity in Indonesia) and it contributes significantly to export earnings and employment. However, dominant producers argue that the increase in economies of scale and scope lead to an increase in the efficiency, which eventually will be beneficial for the end consumers and export earnings. This research seeks to examine whether the dominant producers do behave competitively and pass the efficiency gains to the end consumers, or they enhance inefficiency through market power instead. In order to identify the most suitable model to measure market power in the Indonesian CPO industry, different market power models are explored. These models can be divided into static and dynamic models. In general, all of them accept the price–cost margins as a measure of market power. However, static models fail to reveal the dynamic behaviour that determines market power; hence the dynamic models are likely to be more appropriate to modelling market power. Among these dynamic models, the adjustment model with a linear quadratic specification is considered to be a more appropriate model to measure market power in the Indonesian CPO industry. In the Indonesian CPO industry, producers can be divided into three groups, namely the public estates, private companies and smallholders. However, based on their ability to influence market price, smallholders are not considered as one of the dominant groups. By using the adjustment cost model, the market power of the dominant groups is estimated. The model is estimated using a Bayesian technique annual data spanning 1968–2003. The public estates and private companies are assumed to engage in a noncooperative game. They are assumed to use Markovian strategies, which permit firms to respond to changes in the state vector. In this case, the vector comprises the firms and their rivals’ previous action, implying that firms respond to changes in their rivals’ previous action. The key contribution of this thesis is the relaxation of the symmetry assumption in the estimation process. Although the existence of an asymmetric condition often complicates the estimation process, the different characteristics of the public estates and private companies lead to a need for relaxing such an assumption. In addition, the adjustment system—which can be seen as a type of reaction function—is not restricted to have downward slopes. Negative reaction functions are commonly assumed for a quantity setting game. However, the reverse may occur in particular circumstances. Without such restrictions, the analysis could reveal the type of interaction between the public estates and private companies. In addition, it provides insights into empirical examples of conditions that might lead to the positive reaction function. Furthermore, the analysis adds to the understanding of the impact of positive reaction functions to avoid the complicated estimation of the asymmetric case. As expected, the public estates act as the leader, while the private companies are the follower. Interestingly, results indicate that as well as the private companies, public estates do exert some degree of market power. Moreover, the public estates enjoy even higher market power than the private companies, as indicated by market power indices of -0.46 and -0.72, respectively. The exertion of market power by both the public estates and the private companies cast some doubts about the effectiveness of some current policies in the Indonesian CPO industry. With market power, the underlying assumption of a perfectly competitive market condition—that serves as the basis for the government interventions—is no longer applicable. Hence, many government interventions are unlikely to have the desired effect. The Indonesian competition law that has been imposed since 1999 might be effective in preventing firms to sign collusive contracts. In fact, even without such an agreement, firms in the CPO industry are likely to exert some degree of market power. As an alternative, eliminating the ‘sources’ of market power might be a better solution. If the public estates have the aim of maximising welfare, privatisation might improve their efficiency, hence they have ability to suppress the private companies’ market power. However, if in fact, the public estates deliberately reduce output to gain higher profit, privatisation might increase the degree of market power of both groups of companies even further. In such a condition, addressing the long term barriers of entry stemming from the requirement of high investment might be a better alternative to address the market power problem in the CPO industry.

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Chalil, Diana. "AN EMPIRICAL ANALYSIS OF ASYMMETRIC DUOPOLY IN THE INDONESIAN CRUDE PALM OIL INDUSTRY". University of Sydney, 2008. http://hdl.handle.net/2123/2566.

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Doctor of Philosophy
The apparent increase in market concentration and vertical integration in the Indonesian crude palm oil (CPO) industry has led to concerns about the presence of market power. For the Indonesian CPO industry, such concerns attract more attention because of the importance of this sector to the Indonesian economy. CPO is used as the main raw material for cooking oil (which is an essential commodity in Indonesia) and it contributes significantly to export earnings and employment. However, dominant producers argue that the increase in economies of scale and scope lead to an increase in the efficiency, which eventually will be beneficial for the end consumers and export earnings. This research seeks to examine whether the dominant producers do behave competitively and pass the efficiency gains to the end consumers, or they enhance inefficiency through market power instead. In order to identify the most suitable model to measure market power in the Indonesian CPO industry, different market power models are explored. These models can be divided into static and dynamic models. In general, all of them accept the price–cost margins as a measure of market power. However, static models fail to reveal the dynamic behaviour that determines market power; hence the dynamic models are likely to be more appropriate to modelling market power. Among these dynamic models, the adjustment model with a linear quadratic specification is considered to be a more appropriate model to measure market power in the Indonesian CPO industry. In the Indonesian CPO industry, producers can be divided into three groups, namely the public estates, private companies and smallholders. However, based on their ability to influence market price, smallholders are not considered as one of the dominant groups. By using the adjustment cost model, the market power of the dominant groups is estimated. The model is estimated using a Bayesian technique annual data spanning 1968–2003. The public estates and private companies are assumed to engage in a noncooperative game. They are assumed to use Markovian strategies, which permit firms to respond to changes in the state vector. In this case, the vector comprises the firms and their rivals’ previous action, implying that firms respond to changes in their rivals’ previous action. The key contribution of this thesis is the relaxation of the symmetry assumption in the estimation process. Although the existence of an asymmetric condition often complicates the estimation process, the different characteristics of the public estates and private companies lead to a need for relaxing such an assumption. In addition, the adjustment system—which can be seen as a type of reaction function—is not restricted to have downward slopes. Negative reaction functions are commonly assumed for a quantity setting game. However, the reverse may occur in particular circumstances. Without such restrictions, the analysis could reveal the type of interaction between the public estates and private companies. In addition, it provides insights into empirical examples of conditions that might lead to the positive reaction function. Furthermore, the analysis adds to the understanding of the impact of positive reaction functions to avoid the complicated estimation of the asymmetric case. As expected, the public estates act as the leader, while the private companies are the follower. Interestingly, results indicate that as well as the private companies, public estates do exert some degree of market power. Moreover, the public estates enjoy even higher market power than the private companies, as indicated by market power indices of -0.46 and -0.72, respectively. The exertion of market power by both the public estates and the private companies cast some doubts about the effectiveness of some current policies in the Indonesian CPO industry. With market power, the underlying assumption of a perfectly competitive market condition—that serves as the basis for the government interventions—is no longer applicable. Hence, many government interventions are unlikely to have the desired effect. The Indonesian competition law that has been imposed since 1999 might be effective in preventing firms to sign collusive contracts. In fact, even without such an agreement, firms in the CPO industry are likely to exert some degree of market power. As an alternative, eliminating the ‘sources’ of market power might be a better solution. If the public estates have the aim of maximising welfare, privatisation might improve their efficiency, hence they have ability to suppress the private companies’ market power. However, if in fact, the public estates deliberately reduce output to gain higher profit, privatisation might increase the degree of market power of both groups of companies even further. In such a condition, addressing the long term barriers of entry stemming from the requirement of high investment might be a better alternative to address the market power problem in the CPO industry.

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Sushko, John. "Asymmetric Passive Dynamic Walker Used to Examine Gait Rehabilitation Methods". Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3373.

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Testing gait rehabilitation devices on humans can be a difficult task, due to the effects of the neurological controls of the human body. This thesis advances the use of a passive dynamic walker (PDW) tuned to have asymmetric gait patterns similar to those with physical impairments to test rehabilitation devices. A passive dynamic walker is a multipendulum system that has a stable gait pattern when walking down a slope without any energy inputs except the forces due to gravity. A PDW model is better suited for testing rehabilitation devices because it has been shown to resemble human gait and separates the human neurological controls from the purely dynamic aspects of walking. This research uses different asymmetric gait patterns based on an asymmetric PDW to aid in the design of current and future rehabilitation methods. There are four major parts to this research: (1) the derivation of the current nine mass PDW model, (2) the effects of changing the moment of inertia and center of mass on each leg, (3) the effects of having a leg that is longer than the other and adding masses on the opposite leg to generate a symmetric gait, and (4) the design of a theoretical prosthesis that will break the assumption that the knee on the prosthetic leg should be in the same location as the intact leg. The result of changing the moment of inertia and center of mass on each leg in the nine mass model showed that it is an improvement over the previously used five mass model. This is because the five mass model forces the center of mass to change with the moment of inertia, while the nine mass model allows these to be changed independently of each other. A theoretical prosthesis has been developed in this research that is is significantly lighter while maintaining a symmetric gait. This was accomplished by moving the knee of the prosthetic limb below the location of the intact knee.

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Oliveira, Érica Diniz. "Essays on household taxation and competition between heterogeneous firms". reponame:Repositório Institucional do FGV, 2014. http://hdl.handle.net/10438/13304.

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Essa tese é constituída por três artigos: 'Tax Filing Choices for the Household', 'Optimal Tax for the Household: Collective and Unitary Approaches' e 'Vertical Differentiation and Heterogeneous Firms'.

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Srinivasan, Sujatha. "Low-dimensional modeling and analysis of human gait with application to the gait of transtibial prosthesis users". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1179865923.

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Jhan, Ru-Yi, e 詹如意. "Competition in a Differentiated Products Duopoly on the Asymmetric Barbell Model". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/64503152514487063262.

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Lemieux, James Michael Peterson Robert A. "A dynamic model of asymmetric price negotiation". 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1610/lemieuxj40778.pdf.

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Lemieux, James Michael. "A dynamic model of asymmetric price negotiation". Thesis, 2005. http://hdl.handle.net/2152/1610.

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Lin, Po Hung, e 林伯宏. "Asymmetric Asset Market Analysis in a Two-Country Dynamic Stochastic General Equilibrium Model". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/15847406479556414933.

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Ho, I.-Chun, e 何怡諄. "Asymmetric Dynamic Diffusion research：An Empirical Investigation of Short-Term Interest Rate Model in Taiwan". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/67758235409938258361.

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碩士
淡江大學
財務金融學系碩士班
93
This paper estimates a dynamics model of short-term interest rate and allows sensitivity of the volatility process to interest rate levels. The empirical results that GARCH effect, NARCH effect and stochastic volatility effect in the diffusion function fit the date well and superior to the single factor model of the level effect. If we use GARCH model to estimate the diffusion process will cause over-evaluate the fluctuation, so this paper especially make use of NARCH model to describe the true dynamic fluctuation reacts of short interest rate. The empirical research points out that modeling of the linear drift GARCH model and the nonlinear drift NARCH model in the short interest rate are the best. In addition, I develop some asymmetric framework in mean and diffusion function. When estimating the nonlinear drift NARCH model, the asymmetric response in the drift function is the best model.

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Libri sul tema "Asymmetric dynamic duopoly model"

Padilla, A. Jorge. Dynamic duopoly with consumer switching costs: An overlapping generations model. Oxford: Nuffield College, 1992.

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Hu, Sheng C. Optimal advertising pricing policies in a mature market: A dynamic duopoly model. West Lafayette, Ind: Institute for Research in the Behavioral, Economic, and Management Sciences, Krannert Graduate School of Management, Purdue University, 1989.

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Capitoli di libri sul tema "Asymmetric dynamic duopoly model"

Pain, Anindya. "A Constitutive Model to Capture Asymmetric Behavior of Soil Under Dynamic Loading". In Lecture Notes in Civil Engineering, 441–51. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6086-6_36.

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Tolwinski, B. "EQUILIBRIA IN A SEQUENTIAL DUOPOLY MODEL". In Dynamic Modelling and Control of National Economies 1989, 53–60. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-08-037538-0.50015-0.

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"Optimal New Service Pricing in Duopoly (Dynamic Model)". In Optimal Investment and Marketing Strategies, 49–59. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814383271_0006.

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Martinez-Garcia, Edgar Alonso, e José A. Aguilera. "Dynamic Modelling and Control of an Underactuated Quasi-Omnidireccional Hexapod". In Handbook of Research on Advanced Mechatronic Systems and Intelligent Robotics, 377–400. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0137-5.ch016.

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This chapter presents the mechanical design, dynamic model, and walking control law of an insect-like, asymmetric hexapod robot. The proposed model is an original walking mechanism designed with three actuators to provide quasi-omnidirectionality. One of the motivational aims is to reduce the number of actuators preserving similar holonomy as compared to popular 18-servo redundant hexapods with three servos per leg. This work includes the Klann mechanism as limb, two-drive differential robot's control, one per lateral triplet of legs. The legs of a triplet are synchronized in speed with different rotary angles phase. In addition, the six limbs are synchronized with bidirectional yaw motion. The proposed mechanical design has one servo for limbs yawing, one for the right limbs triplet and one motor for the left triplet. Thus, quasi-omnidirectional mobility is achieved. Furthermore, a dynamic control law that governs the robot's mechanisms motion is deduced, with an Euler-Lagrange approach. Kinematic and dynamic results are validated through numerical simulations using a tripod gait.

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Grabowski, Wojciech. "Stock Markets of the Visegrad Countries after Their Accession to the European Union". In Banking and Finance. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92102.

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In this chapter, interlinkages between stock markets in CEE-4 countries and capital markets in developed countries are analyzed. Changes of variance on stock markets in Poland, the Czech Republic, Slovakia, and Hungary are identified. Differences among countries are analyzed. Capital markets of these countries are compared in terms of market efficiency. Moreover, co-movements of stock markets in Visegrad countries with capital markets in developed countries are studied. Different specifications of multivariate GARCH models are studied. Asymmetric GARCH-BEKK model and Asymmetric Generalized Dynamic Conditional Correlation model are considered.

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Yildirim, Ecenur Ugurlu. "Globalization of Stock Market, Economic Growth, and Geopolitical Risk". In Handbook of Research on Institutional, Economic, and Social Impacts of Globalization and Liberalization, 157–68. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4459-4.ch009.

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Although the significance of the foreign investors constructing the significant magnitude of GDP increases for the emerging markets, their equity markets' attractiveness is affected by their vulnerability to geopolitical risk. The purpose of this study is to empirically investigate the effect of the stock market globalization on the correlation between economic growth and geopolitical risk in Brazil. After the dynamic correlation between economic growth and the geopolitical risk in Brazil is obtained by DCC-GARCH(1,1) methodology, the nonlinear autoregressive distributed lag (NARDL) model is employed to examine the asymmetric relationship among variables. The findings demonstrate while the changes in the globalization of the stock market decrease the connection between economic growth and geopolitical risk in the long-run, the positive changes in the participation of foreign investors make economic growth and geopolitical risk more connected the in short-run. Moreover, this impact is asymmetric. This chapter provides valuable implications for international investors and policymakers.

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Zagare, Frank C. "A General Explanation of the Cuban Missile Crisis". In Game Theory, Diplomatic History and Security Studies, 83–98. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198831587.003.0006.

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This chapter develops a new explanation of the Cuban missile crisis, from a general escalation model of interstate conflict. Specifically, the equilibrium structure of the Asymmetric Escalation Game with incomplete information is used to explain the initiation, development, and resolution of the crisis. This model brings with it a clear set of theoretical expectations about the conditions under which a limited conflict can occur. It also explains why intense interstate disputes occur and, if and when they do, they are successfully resolved (or not). Answers to all three of the foundational questions traditionally associated with the crisis are derived from an examination of the model’s strategic dynamic. The model’s applicability to the strategic relationship of the United States and North Korea is also discussed.

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Kushwaha, Deendayal, Sridhar Janagam e Neeta Trivedi. "Compute-Efficient Geo-Localization of Targets From UAV Videos". In Unmanned Aerial Vehicles, 235–48. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8365-3.ch010.

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Unmanned Air Vehicles (UAVs) have crucial roles to play in traditional warfare, asymmetric conflicts, and also civilian applications such as search and rescue operations. Though satellites provide extensive coverage and capabilities crucial to many remote sensing tasks, UAVs have distinct edge over satellites in dynamic situations due to shorter revisit times and desired area/time coverage. The course, speed and altitude of a UAV can be dynamically altered, details of an activity of interest monitored by loitering over the area as desired. A fundamental requirement in most UAV operations is to find geo-coordinates of an object in the captured image. Most small, low-cost UAVs use low-cost, less accurate sensors. Matching with pre-registered images may not be possible in areas with low details or in emergency situations where terrain may have undergone severe sudden changes. In these situations that demand near real-time results and wider coverage, it is often enough to provide approximate results as long as bounds on accuracies can be established. Even when image registration is possible, it can benefit from these bounds to reduce search space thereby saving execution time. The prime contributions of this paper are computation of location of target anywhere in the image even at larger slant ranges, optimized algorithm to compute terrain elevation at target point, and use of visual simulation tool to validate the model. Analysis from simulation and results from real UAV flights are presented.

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Atti di convegni sul tema "Asymmetric dynamic duopoly model"

Jiang, Tingting, Zheng He e Guangming Xiang. "Sustainability of Social Pension Enterprises: A Dynamic Cournot Duopoly Model". In ICEME 2022: 2022 13th International Conference on E-business, Management and Economics. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3556089.3556114.

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Muralidharan, Ajith, e Roberto Horowitz. "Imputation of Ramp Flow Data Using the Asymmetric Cell Transmission Traffic Flow Model". In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2721.

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The Asymmetric Cell Transmission model can be used to simulate traffic flows in freeway sections. The model is specified by fundamental diagram parameters—determined from mainline data, and on-ramp and off-ramp flows. The mainline flow/density data are efficiently archived and readily available, but the ramp flow data are generally found missing. This paper presents an imputation technique based on iterative learning control to determine these flows. The imputation technique is applied sequentially on all the segments of the freeway, and the ramp flows, which minimize the error between the model calculated densities/flows and measurements are investigated. The stability and convergence of the density and flow errors using the imputation updates is also presented. Finally an example is shown to illustrate its use in a practical scenario.

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Perers, Bengt. "An Improved Dynamic Solar Collector Model Including Condensation and Asymmetric Incidence Angle Modifiers". In EuroSun 2010. Freiburg, Germany: International Solar Energy Society, 2010. http://dx.doi.org/10.18086/eurosun.2010.09.20.

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Lu, Yan, Jingyu Yan e Yeung Yam. "A Generalized ECG Dynamic Model with Asymmetric Gaussians and its Application in Model-Based ECG Denoising". In 2009 2nd International Conference on Biomedical Engineering and Informatics. IEEE, 2009. http://dx.doi.org/10.1109/bmei.2009.5305699.

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Tripathi, Abhinav, e Zongxuan Sun. "Nonlinear Feedforward Control for Electrohydraulic Actuators With Asymmetric Piston Areas". In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9721.

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This paper presents a new design method of a nonlinear feedforward controller for electrohydraulic actuators with asymmetric piston areas. While the use of flatness based inversion of the plant model to design a feedforward controller has been reported for electrohydraulic actuators with symmetric piston area, the extension of this method to actuators with asymmetric piston areas is non-trivial. In asymmetric electrohydraulic actuators, the areas of the hydraulic piston are different in the two chambers, and hence, the amount of fluid going into one chamber of the actuator is not equal to the amount of fluid coming out of the other. This asymmetry leads to loss of flatness, and hence, flatness based inversion of the plant is no longer possible. In this paper, we present a method for calculation of the feedforward control signal for a given trajectory by numerically solving the inverse problem for the system. We demonstrate the effectiveness of the proposed feedforward controller by simulation of trajectory tracking in an asymmetric electrohydraulic actuator. For benchmarking, the tracking performance has been compared with three other feedforward schemes: a linearized model based Zero Phase Error Tracking (ZPET) feedforward controller, a nonlinear feedforward controller implementing an approximate plant inversion based on differential flatness, and a pressure feedback based feedforward controller.

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Zaman, Rahid, Joel Quarnstrom, Yujiang Xiang, Ritwik Rakshit e James Yang. "Hybrid Predictive Model for Assessing Spinal Loads for 3d Asymmetric Lifting". In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-89127.

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Abstract In this study, a hybrid predictive model is used to predict 3D asymmetric lifting motion and assess potential musculoskeletal lower back injuries for asymmetric lifting tasks. The hybrid model has two modules: a skeletal module and an OpenSim musculoskeletal module. The skeletal module consists of a dynamic joint strength based 40 degrees of freedom spatial skeletal model. The skeletal module can predict the lifting motion, ground reaction forces (GRFs), and center of pressure (COP) trajectory using an inverse dynamics based optimization method. The equations of motion are built by recursive Lagrangian dynamics. The musculoskeletal module consists of a 324-muscle-actuated full-body lumbar spine model. Based on the generated kinematics, GRFs and COP data from the skeletal module, the musculoskeletal module estimates muscle activations using static optimization and joint reaction forces through the joint reaction analysis tool. Muscle activation results between simulated and experimental EMG are compared to validate the model. Finally, potential lower back injuries are evaluated for a specific-weight asymmetric lifting task. The shear and compression spine loads are compared to NIOSH recommended limits. At the beginning of the dynamic lifting process, the simulated compressive spine load beyond the NIOSH action limit but less than the permissible limit. This is due to the fatigue factors considered in NIOSH lifting equation.

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Balike, Krishna Prasad, Subhash Rakheja e Ion Stiharu. "A Comprehensive Quarter-Car Model for Kinematic and Dynamic Analysis of a Suspension". In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11621.

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The conflicting dynamic performances of a vehicle such as ride quality, road holding and rattle space requirements have been widely studied using either linear or nonlinear two DOF quarter-car models. Such models, however, cannot account for contributions due to suspension kinematics and joint compliances. Considering the proven simplicity and effectiveness of a quarter-car model for such analyses, this paper discusses a comprehensive quarter-car dynamic model to study the influences of the linkage geometry and flexible joint bushings on selected performance measures. An in-plane two-DOF model was formulated for a double wishbone suspension comprising an upper control arm, a lower control arm, and a strut mounted on the lower control arm. The dynamic responses of the model were evaluated under harmonic and idealized rounded-pulse displacement excitations. The responses of the proposed model with free and flexible joint conditions were compared with those of the conventional quarter-car model to illustrate the contributions due to suspension kinematics and joint bushings. Owing to the asymmetric kinematic behavior of the suspension system, the dynamic responses of the comprehensive model were also observed to be asymmetric about the equilibrium. The responses of the model with flexible joint bushings revealed approximately 5% variations from that of the model with free joints. Furthermore, the upper control arm bushings have exhibited more significant influence on the dynamic responses than that of the lower control arm bushings.

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Karpat, F., e S. Ekwaro-Osire. "Wear of Involute Spur Gears With Asymmetric Teeth Under Dynamic Loading". In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15028.

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Spur gears with asymmetric teeth have a significant potential for some applications requiring extreme performance like in the aerospace industry. In this study, the influence of tooth wear on the dynamic behavior of involute spur gears with asymmetric teeth is analyzed. The Archard's wear model was adopted in formulating and accounting for wear. Effects of gear parameters such as gear contact ratio, tooth height, mesh stiffness, and pressure angles on tooth wear are considered. These parameters are used to describe the relationship between dynamic tooth load and tooth wear. A comparison of symmetric and asymmetric teeth is also presented with respect to tooth wear. Sample simulation results, which were obtained by using an in-house developed computer program, are illustrated with numerical examples. The numerical results match well with the practical and analytical results which are available in literature. For asymmetric teeth, it was shown that the wear depth decreased with increasing pressure angle on drive side.

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Mohanty, Amit, e Bin Yao. "Indirect Adaptive Robust Control of Uncertain Systems With Unknown Asymmetric Input Deadband Using a Smooth Inverse". In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2771.

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In this paper, we present an indirect adaptive robust controller (IARC) for output tracking of a class of uncertain nonlinear systems with unknown input asymmetric deadband in presence of uncertain nonlinearities and parametric uncertainties. Most of the parameter adaptation algorithms, such as, gradient-type and least squares-type require that the unknown parameters of a system appear in affine with known regressor functions globally. However, deadband nonlinearity can not be represented in those global linear parametric form. Therefore, the existing parameter estimation algorithms for deadband focus on some approximate linear parametric model. Hence, even in absence of any other uncertain nonlinearities and disturbances, these algorithms can never achieve asymptotic tracking. Departing from those approximate deadband estimation, we design an indirect parameter estimation algorithm with online condition monitoring. This parameter estimation algorithm in conjunction with a well-designed robust controller and a deadband inverse function can be used to obtain asymptotic tracking without restoring to discontinuous control law. With this strong result in our repertoire, we proceed to design a smooth deadband inverse (SDI) function to avoid certain problems during implementation, e.g, control input chattering and significant appearance of high-frequency dynamics. The effect of such an approximation on the L2-norm of output tracking error is analytically determined. We also show that while operating away from the deadband, the proposed controller even with an SDI can achieve asymptotic tracking. In presence of disturbances and other uncertain nonlinearities, the proposed IARC controller attains guaranteed transient performance and final tracking accuracy.

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Brumfield, Lance Austin, e Sunggook Park. "The Effects of Asymmetric Micro Ratchets on Dynamic Contact Angle and Pool Boiling Performance". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87176.

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The dynamic advancing and receding contact angles of 5μl water droplets were experimentally measured via the droplet impingement technique on a polished brass surface, one brass symmetric micro ratchet, and five brass asymmetric micro ratchet samples of varying dimensions. Droplets were released from varying heights (Weber number) and the impacts studied via high speed camera. Equilibrium advancing and receding contact angles were measured by placing a water droplet on the surfaces and tilting it. Contact angle values were then compared to an existing pool boiling model which incorporates the dynamic receding contact angle, surface roughness ratio, and equilibrium contact angle.

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